'\" t
.\"     Title: ALTER DEFAULT PRIVILEGES
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 2021
.\"    Manual: PostgreSQL 13.3 Documentation
.\"    Source: PostgreSQL 13.3
.\"  Language: English
.\"
.TH "ALTER DEFAULT PRIVILEGES" "7" "2021" "PostgreSQL 13.3" "PostgreSQL 13.3 Documentation"
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.SH "NAME"
ALTER_DEFAULT_PRIVILEGES \- define default access privileges
.SH "SYNOPSIS"
.sp
.nf
ALTER DEFAULT PRIVILEGES
    [ FOR { ROLE | USER } \fItarget_role\fR [, \&.\&.\&.] ]
    [ IN SCHEMA \fIschema_name\fR [, \&.\&.\&.] ]
    \fIabbreviated_grant_or_revoke\fR

where \fIabbreviated_grant_or_revoke\fR is one of:

GRANT { { SELECT | INSERT | UPDATE | DELETE | TRUNCATE | REFERENCES | TRIGGER }
    [, \&.\&.\&.] | ALL [ PRIVILEGES ] }
    ON TABLES
    TO { [ GROUP ] \fIrole_name\fR | PUBLIC } [, \&.\&.\&.] [ WITH GRANT OPTION ]

GRANT { { USAGE | SELECT | UPDATE }
    [, \&.\&.\&.] | ALL [ PRIVILEGES ] }
    ON SEQUENCES
    TO { [ GROUP ] \fIrole_name\fR | PUBLIC } [, \&.\&.\&.] [ WITH GRANT OPTION ]

GRANT { EXECUTE | ALL [ PRIVILEGES ] }
    ON { FUNCTIONS | ROUTINES }
    TO { [ GROUP ] \fIrole_name\fR | PUBLIC } [, \&.\&.\&.] [ WITH GRANT OPTION ]

GRANT { USAGE | ALL [ PRIVILEGES ] }
    ON TYPES
    TO { [ GROUP ] \fIrole_name\fR | PUBLIC } [, \&.\&.\&.] [ WITH GRANT OPTION ]

GRANT { USAGE | CREATE | ALL [ PRIVILEGES ] }
    ON SCHEMAS
    TO { [ GROUP ] \fIrole_name\fR | PUBLIC } [, \&.\&.\&.] [ WITH GRANT OPTION ]

REVOKE [ GRANT OPTION FOR ]
    { { SELECT | INSERT | UPDATE | DELETE | TRUNCATE | REFERENCES | TRIGGER }
    [, \&.\&.\&.] | ALL [ PRIVILEGES ] }
    ON TABLES
    FROM { [ GROUP ] \fIrole_name\fR | PUBLIC } [, \&.\&.\&.]
    [ CASCADE | RESTRICT ]

REVOKE [ GRANT OPTION FOR ]
    { { USAGE | SELECT | UPDATE }
    [, \&.\&.\&.] | ALL [ PRIVILEGES ] }
    ON SEQUENCES
    FROM { [ GROUP ] \fIrole_name\fR | PUBLIC } [, \&.\&.\&.]
    [ CASCADE | RESTRICT ]

REVOKE [ GRANT OPTION FOR ]
    { EXECUTE | ALL [ PRIVILEGES ] }
    ON { FUNCTIONS | ROUTINES }
    FROM { [ GROUP ] \fIrole_name\fR | PUBLIC } [, \&.\&.\&.]
    [ CASCADE | RESTRICT ]

REVOKE [ GRANT OPTION FOR ]
    { USAGE | ALL [ PRIVILEGES ] }
    ON TYPES
    FROM { [ GROUP ] \fIrole_name\fR | PUBLIC } [, \&.\&.\&.]
    [ CASCADE | RESTRICT ]

REVOKE [ GRANT OPTION FOR ]
    { USAGE | CREATE | ALL [ PRIVILEGES ] }
    ON SCHEMAS
    FROM { [ GROUP ] \fIrole_name\fR | PUBLIC } [, \&.\&.\&.]
    [ CASCADE | RESTRICT ]
.fi
.SH "DESCRIPTION"
.PP
\fBALTER DEFAULT PRIVILEGES\fR
allows you to set the privileges that will be applied to objects created in the future\&. (It does not affect privileges assigned to already\-existing objects\&.) Currently, only the privileges for schemas, tables (including views and foreign tables), sequences, functions, and types (including domains) can be altered\&. For this command, functions include aggregates and procedures\&. The words
FUNCTIONS
and
ROUTINES
are equivalent in this command\&. (ROUTINES
is preferred going forward as the standard term for functions and procedures taken together\&. In earlier PostgreSQL releases, only the word
FUNCTIONS
was allowed\&. It is not possible to set default privileges for functions and procedures separately\&.)
.PP
You can change default privileges only for objects that will be created by yourself or by roles that you are a member of\&. The privileges can be set globally (i\&.e\&., for all objects created in the current database), or just for objects created in specified schemas\&.
.PP
As explained in
Section\ \&5.7, the default privileges for any object type normally grant all grantable permissions to the object owner, and may grant some privileges to
PUBLIC
as well\&. However, this behavior can be changed by altering the global default privileges with
\fBALTER DEFAULT PRIVILEGES\fR\&.
.PP
Default privileges that are specified per\-schema are added to whatever the global default privileges are for the particular object type\&. This means you cannot revoke privileges per\-schema if they are granted globally (either by default, or according to a previous
\fBALTER DEFAULT PRIVILEGES\fR
command that did not specify a schema)\&. Per\-schema
REVOKE
is only useful to reverse the effects of a previous per\-schema
GRANT\&.
.SS "Parameters"
.PP
\fItarget_role\fR
.RS 4
The name of an existing role of which the current role is a member\&. If
FOR ROLE
is omitted, the current role is assumed\&.
.RE
.PP
\fIschema_name\fR
.RS 4
The name of an existing schema\&. If specified, the default privileges are altered for objects later created in that schema\&. If
IN SCHEMA
is omitted, the global default privileges are altered\&.
IN SCHEMA
is not allowed when setting privileges for schemas, since schemas can\*(Aqt be nested\&.
.RE
.PP
\fIrole_name\fR
.RS 4
The name of an existing role to grant or revoke privileges for\&. This parameter, and all the other parameters in
\fIabbreviated_grant_or_revoke\fR, act as described under
\fBGRANT\fR(7)
or
\fBREVOKE\fR(7), except that one is setting permissions for a whole class of objects rather than specific named objects\&.
.RE
.SH "NOTES"
.PP
Use
\fBpsql\fR(1)\*(Aqs
\fB\eddp\fR
command to obtain information about existing assignments of default privileges\&. The meaning of the privilege display is the same as explained for
\fB\edp\fR
in
Section\ \&5.7\&.
.PP
If you wish to drop a role for which the default privileges have been altered, it is necessary to reverse the changes in its default privileges or use
\fBDROP OWNED BY\fR
to get rid of the default privileges entry for the role\&.
.SH "EXAMPLES"
.PP
Grant SELECT privilege to everyone for all tables (and views) you subsequently create in schema
myschema, and allow role
webuser
to INSERT into them too:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER DEFAULT PRIVILEGES IN SCHEMA myschema GRANT SELECT ON TABLES TO PUBLIC;
ALTER DEFAULT PRIVILEGES IN SCHEMA myschema GRANT INSERT ON TABLES TO webuser;
.fi
.if n \{\
.RE
.\}
.PP
Undo the above, so that subsequently\-created tables won\*(Aqt have any more permissions than normal:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER DEFAULT PRIVILEGES IN SCHEMA myschema REVOKE SELECT ON TABLES FROM PUBLIC;
ALTER DEFAULT PRIVILEGES IN SCHEMA myschema REVOKE INSERT ON TABLES FROM webuser;
.fi
.if n \{\
.RE
.\}
.PP
Remove the public EXECUTE permission that is normally granted on functions, for all functions subsequently created by role
admin:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER DEFAULT PRIVILEGES FOR ROLE admin REVOKE EXECUTE ON FUNCTIONS FROM PUBLIC;
.fi
.if n \{\
.RE
.\}
.sp
Note however that you
\fIcannot\fR
accomplish that effect with a command limited to a single schema\&. This command has no effect, unless it is undoing a matching
GRANT:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER DEFAULT PRIVILEGES IN SCHEMA public REVOKE EXECUTE ON FUNCTIONS FROM PUBLIC;
.fi
.if n \{\
.RE
.\}
.sp
That\*(Aqs because per\-schema default privileges can only add privileges to the global setting, not remove privileges granted by it\&.
.SH "COMPATIBILITY"
.PP
There is no
\fBALTER DEFAULT PRIVILEGES\fR
statement in the SQL standard\&.
.SH "SEE ALSO"
\fBGRANT\fR(7), \fBREVOKE\fR(7)
